403899561 has 32 divisors (see below), whose sum is σ = 651096320. Its totient is φ = 245970432.

The previous prime is 403899557. The next prime is 403899571. The reversal of 403899561 is 165998304.

It is a happy number.

403899561 is a `hidden beast` number, since 4 + 0 + 3 + 89 + 9 + 561 = 666.

It is not a de Polignac number, because 403899561 - 2² = 403899557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403899521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28116 + ... + 39978.

It is an arithmetic number, because the mean of its divisors is an integer number (20346760).

Almost surely, 2^403899561 is an apocalyptic number.

It is an amenable number.

403899561 is a deficient number, since it is larger than the sum of its proper divisors (247196759).

403899561 is a wasteful number, since it uses less digits than its factorization.

403899561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11982 (or 11976 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 403899561 is about 20097.2525734241. The cubic root of 403899561 is about 739.1929117584.

The spelling of 403899561 in words is "four hundred three million, eight hundred ninety-nine thousand, five hundred sixty-one".